Telephone-transmitter



Q M m 2 Sheets-Sheet 1. G. 'GLAMOND. TELEPHONE TRANSMITTER.

Patented June 11, 1895.

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TELEPHONE TRANSMITTER. No. 541,036. Patented June 11, 1895..

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CHARLES OLAIWIOND, OF PARIS, FRANCE, ASSIGNOR TO THE QLAMOND TELEPHONE COMPANY, OF PHILADELPHIA, PENNSYLVANIA.

TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 541,036, dated June 11, 1895.

Application filed March 20, 1895. Serial No. 542,445. (No model.)

To all whom it may concern.- v

Be it known that I, CHARLES CLAMOND, a citizen of the Republic of France, and a resident of Paris,in the Departmentot the Seine,

Republic of France, have invented certain new and useful Improvements in Telephone- Transmitters, of which the followingisa specification.

My invention relates to apparatus for the telephonic transmission of speech, in which plastic viscid conducting paste of the character set forth in United States Letters Patent, No. 486,244, granted to me November 15, 1892, constitutes a microphonic element.

Telephone transmitters embodying my improvements are represented in the accompanying drawings and hereinafter described.

In the drawings, Figure 1 is a central vertical side sectional elevation through a transmitter typically embodyingaconvenient form of my improvements. Fig. 2 is a view in perspective of the bridge illustrated in the transmitter of said figure removed from the eas- Fig. 3 is a view similar to Fig. 1 of a transmitter embodying a modified form of my improvements; and Fig. 4 is a view similar to, Figs. 1 and 3 of a transmitter embodying my improvements and representing them as incorporated in a casing such as is represented in United States Letters Patent No. 372,455, granted to me November 1, 1887.

Similar letters of reference indicate corresponding parts.

- face of the cavity opposite to the central portion of the diaphragm B, and at or about the middle of the raised portion of the bridge is a circular aperture 0. This aperture receives loosely a metal ball D, the radius of which slightly exceeds the height of the bridge, so that when the instrument is in a vertical pothronghthe paste to the diaphragm B, which constitutes a vibratory electrode, and is connected with the other member of the line by the wire F. l

I have found by the use of a ball encompassed by the paste and supported in the described relation to the diaphragm, the operation of the instrument is much improved, and the necessity for adjustment between the movable and fixed electrodes is dispensed with.

In Fig. 31 have illustratedan instrument differing in some details from the'above. In this instrument the non-conducting casing A, is not the immediate receptacle for the paste, but contains a metallic chamber G, in which the paste a is placed as in the first described casing. This chamber has mounted'upon its inner face the bridge 0, the aperture 0 of which receives the metal ball E. A thin diaphragm H, of elastic non-conducting material, cioses the opening of the chamber. The s0und-receiving diaphragm B, of conducting material closes the opening of the outer casing A, and carries at its center an inwardly projecting stud b, which passes through the diaphragm H which closes the mouth of the paste chamber. Said stud thus constitutes a vibratory electrode whose inner end is within the paste chamber and opposite to the ball D,

from which, however, it is at all times separated by the intervening thickness of paste. The diaphragm, B and electrode 1) are connected with the line by the conducting wire F. The chamber G is electrically connected with the other member of the line by the. wire E.

The operation of the device for the transmission of speech is identical with that of the device first described.

In Fig. 4 I have illustrated an instrument essentially the same as that represented in Fig. 3, butincorporated in such a casing as is represented in United States Letters Patent No. 372,455, granted to me and hereinbefore referred to,-a receiver I also being shown applied to the transmitter casing, and the parts being represented in the positions which they occupy when the instrument is not in use.

Having thus described my invention, I will state that I am of course aware that the use of a movable ball as a contact piece in a microphone, or variable resistance transmitter, is not new, and I do not claim the same, it being of the essence of my present invention that there should be no conducting contact between the ball and the vibratory electrode of In testimony that I claim the foregoing as my invention I have hereunto signed my name this 8th day of March, A. D. 1895.

CHARLES CLAMOND. In presence of- O. KERR, CLYDE SHROPSHIRE. 

